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Table of Contents
2. [代码]CLS_SCACHER   
3. [代码]CLS_ECACHER    
4. [代码]get_departments.php  
5. [代码]get_users.php  
6. [代码]get_users_complex.php  
Home php教程 PHP源码 使用etag和文件缓存降低服务器数据库压力

使用etag和文件缓存降低服务器数据库压力

PHP中文网
PHP中文网
May 23, 2016 pm 04:38 PM
php

使用php5.3+，使用了一些自定义的内容，不过都一看便知
比如常量ROOT、DIR_CACHE等
核心使用的有
diehere（输出json字符串，并die），err_a（组合错误信息），makedir（连续创建目录）
其余的都根据实际使用的情况来

终于debug完成了……新增one_key方法，一键完成输出，完美……
departments初次查询170ms
之后仅16ms，越复杂效果越好啊

高复杂测试get_users_complex.php
初次108.0 KB  985ms
第二次16ms，哈哈哈，
清空etag（未清空data）读取，接收数据125ms                        

1. [代码]DEF.inc.php    

	define('ROOT',dirname(__FILE__));

	define('CLS_SCACHER','/inc/SCACHER.cls.php');
	define('CLS_ECACHER','/inc/ECACHER.cls.php');

	define('DIR_CACHE','/cache/');	//用于缓存判断的目录


function run_sql($sql){
	static $db;
	if(!$db){
		$db=getdb();
	}
	return mysql_query($sql,$db);
}

function getdb(){
	static $mydb;
	if(!$mydb){
		$mydb=dbconnection();
	}
	return $mydb;
}

function dbconnection(&$var=0){
	
	if($var==0||!is_array($var)){$var=array();}
	if(!isset($var['dbhost']) || !is_string($var['dbhost'])){	$var['dbhost']=constant('DBHOST');}
	if(!isset($var['dbuser']) || !is_string($var['dbuser'])){	$var['dbuser']=constant('DBUSER');}
	if(!isset($var['dbpsw']) || !is_string($var['dbpsw'])){$var['dbpsw']=constant('DBPSW');}
	$db=mysql_connect($var['dbhost'],$var['dbuser'],$var['dbpsw']) or die();
	if(!$db){return 0;}
	mysql_select_db(constant('DBNAME'),$db) or die();//echo('db enter here');
	mysql_query("SET NAMES 'UTF8'");
	return $db;
}

function PR($v){
	if(isset($v)){
		echo(&#39;<pre class="brush:php;toolbar:false">&#39;);
		print_r($v);
		echo(&#39;
'); } } function rs_2_array($rs){ //this is a function used to make the code clear and less //i am tired to code same code to get the arry result //thought it is not much //redlz2500@2008-06-24 $t=array(); try { while($row=mysql_fetch_array($rs,MYSQL_ASSOC)){ $t[]=$row; } return $t; }catch (Exception $e) { } return $t; } /* * 功能：连续建目录 * $dir 目录字符串 */ function makedir($dir,$mode = '0777') { //notice: the $dir will not set the code style & //as maybe call by $str.$str1 //the var can not be reference if(!isset($dir)){return 0;} //echo('
**********intomakedir*************
'.$dir); $dir = str_replace( "\\", "/", $dir ); $mdir = ""; foreach( explode( "/", $dir ) as $val ) { $mdir .= $val."/"; if( $val == ".." || $val == "." ) continue; if( ! file_exists( $mdir ) ) { if(!@mkdir( $mdir, $mode )){ echo "创建目录 [".$mdir."]失败."; exit; } } } return true; }
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2. [代码]CLS_SCACHER 

<?php
/*
//超级简单的文件缓存类，用于ECACHE的数据缓存支持
//使用ROOT.DIR_CACHE作为基本目录，下面再是path划分小目录，category和name组合为缓存文件的名称
//不包括时间有效期，若需使用时间有效判定，使用CLS_CACHER类
//属性配置调用scacher方法
//set($v)直接设置$v的值到缓存
//get()和del()无参数，含义自明
//主要用于CLS_ECACHER的底层支持
//redlz2500@20151022
*/
	
	class scacher{
		protected $fullpath=&#39;&#39;;
		protected $path=&#39;&#39;;	//在ROOT.DIR_CACHE目录下的，左右无目录分隔符
		protected $category=&#39;default&#39;;	//缓存下的分类
		protected $name=&#39;mycache&#39;;	//文件标识名称
		
		public function __construct($opt){
			$this->scacher($opt);
		}
		
		public function scacher($opt=[]){
			$flag=false;
			if($opt[&#39;category&#39;] && is_string($opt[&#39;category&#39;]) && ($this->category!=$opt[&#39;category&#39;]) ){
				$this->category=$opt[&#39;category&#39;];
				$flag=true;
			}
			if($opt[&#39;name&#39;] && is_string($opt[&#39;name&#39;]) && ($this->name!=$opt[&#39;name&#39;])){
				$this->name=$opt[&#39;name&#39;];
				$flag=true;
			}
			if($opt[&#39;path&#39;] && is_string($opt[&#39;path&#39;]) && ($this->pat!=$opt[&#39;path&#39;])){
				$this->path=$opt[&#39;path&#39;];
				$flag=true;
			}
			if($flag){
				if($this->path){
					$this->fullpath=ROOT.DIR_CACHE.$this->path.&#39;/&#39;;
				}else{
					$this->fullpath=ROOT.DIR_CACHE;
				}
				if(!file_exists($this->fullpath)){
					makedir($this->fullpath);
					if(!file_exists($this->fullpath)){
						throw new Exception(&#39;errSCACHER配置失败 当前调用参数：&#39;.$this->category.&#39;.&#39;.$this->name);
					}
				}
			}
		}
		
		public function set($v){
			$fp=fopen($this->fullpath . $this->category .&#39;.&#39;. $this->name,&#39;w&#39;);
			if (!fwrite($fp,$v)) {
				return [&#39;success&#39;=>false,&#39;error&#39;=>err_a(&#39;errSCACHER_1&#39;,&#39;数据写入失败，请稍后重试。<br/>重试无效请联系管理员。<br/>当前调用参数：&#39;.$this->category.&#39;.&#39;.$this->name)];
			}  
			@fclose($fp);
			return [&#39;success&#39;=>true];
		}
		public function get(){
			$f=$this->fullpath . $this->category .&#39;.&#39;. $this->name;
			if(file_exists($f)){
				$res=@file_get_contents($f);
				if(!$res){
					$res=&#39;&#39;;
				}
				return [&#39;success&#39;=>true,&#39;data&#39;=>$res];
			}else{
				return [&#39;success&#39;=>false,&#39;data&#39;=>&#39;&#39;,&#39;error&#39;=>err_a(&#39;errSCACHER_3&#39;,&#39;未找到缓存。<br/>当前调用参数：&#39;.$this->category.&#39;.&#39;.$this->name)];
			}
		}
		public function del(){
			$f=$this->fullpath . $this->category .&#39;.&#39;. $this->name;
			if(file_exists($f)){
				@unlink($f);
				if(file_exists($f)){
					return [&#39;success&#39;=>false,&#39;error&#39;=>err_a(&#39;errSCACHER_2&#39;,&#39;数据处理异常，请稍后重试。<br/>重试无效请联系管理员。<br/>当前调用参数：&#39;.$this->category.&#39;.&#39;.$this->name)];
				}
			}else{
				return [&#39;success&#39;=>true];
			}
		}
	}
?>
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3. [代码]CLS_ECACHER 

<?php
/*
//基于CLS_CACHER的缓存机制，包括etag参数以及其余的数据，主要用于单个的json数据缓存
//主要目的为在服务器端给json方式做缓存，模式如下：
//核心的detail缓存由后台互动生成（也可以由前台生成，方法摆在这里自己组合）
//1、查询端query.php
//	调用etag_chk，相同则 发送304header（默认允许）
//		不同则调用data_get方法，取出缓存，如果取出缓存失败，则前台处理，不重新生成缓存（也可以生成，但是需重新包括缓存生成方法）
//2、数据生成页面trigger.php
//	触发数据重新生成机制 ，生成新的缓存，并更新etag信息，这样做在触发频繁的情况下可能引起大量无必要的数据库操作，
//可在此时修改触发方式，或者触发的时候仅清空数据，但是并不重新生成缓存，而在前台实际调用的时候才执行缓存生成操作
//A、或者是在查询段负责生成数据，触发端负责清空缓存
//	ecacher重设参数
//	mode_etag mode_data在两种模式下切换，内部方法
//	etag_chk	检查浏览器是否一致，一致的话 发送304（默认允许）
//	etag_create	生成新的etag并缓存
//	data_get	获取缓存的data
//	data_create	调用外部定义的方法以及参数生成缓存并重设etag，注意，虽然重设了etag，但是并不会重新发送200
//	clear	清空数据，传入数组
//第一次生成数据的时候可能不正确，未处理	已经解决redlz2500@20151022
//v1.1新增one_key方法
//v1.2增加catch-control输出。某个页面一直无法输出304，检查服务器返回catch-control:no-catch……查不出原因，直接重写了……
//v1.3增加force参数，用于强制输出catch-control控制，默认false，为true强制输出自己的catch-control，以避免和php自己的session_cache_limiter冲突
//redlz2500@20151022
*/

	define(&#39;DEF_ECACHE_PERFECT&#39;,&#39;0001&#39;);	//浏览器发送了匹配的etag，完美，返回304
	define(&#39;DEF_ECACHE_BROWSER_NULL&#39;,&#39;0010&#39;);	//浏览器未发送etag
	define(&#39;DEF_ECACHE_ETAG_NULL&#39;,&#39;0100&#39;);	//本地的etag记录为空（可能是数据真空期）
	define(&#39;DEF_ECACHE_ETAG_CREATED&#39;,&#39;1000&#39;);//etag成功生成

	require_once(ROOT.CLS_SCACHER);//使用scacher类
	
	class ecacher{
		protected $path=&#39;&#39;;
		protected $category=&#39;default&#39;;	//当前类别的分类
		protected $name=&#39;myname&#39;;		//模板名称
		//以上三个是scacher类的定义，方式与ecacher相同，缓存位置由ecacher来控制
		protected $force_cache=false;
		protected $auto_send_etag_header=true;	//是否自动发送header信息

		protected $create_fn=&#39;&#39;;	//没有数据的时候生成数据的回调函数，返回数据由data_create处理，仅支持字符串
		protected $create_par;		//生成数据的时候需要传送的参数，按参数先后顺序组合为array传送，不是数组则自动将其转换为数组
		
		protected $scacher;
		
		public function __construct($opt){
			$this->scacher=new scacher([]);		//scacher实例，路径由scacher来控制
			$this->ecacher($opt);
		}
		
		public function __destruct(){
			
		}
		
		function ecacher($opt){
			if(is_array($opt)){
				if($opt[&#39;force_cache&#39;]){
					$this->force_cache=true;
				}else{
					if(isset($opt[&#39;force_cache&#39;])){
						$this->force_cache=false;
					}
				}
				if($opt[&#39;path&#39;] && is_string($opt[&#39;path&#39;])){
					$this->path=$opt[&#39;path&#39;];
				}
				if($opt[&#39;category&#39;] && is_string($opt[&#39;category&#39;])){
					$this->category=$opt[&#39;category&#39;];
				}
				if($opt[&#39;name&#39;] && is_string($opt[&#39;name&#39;])){
					$this->name=$opt[&#39;name&#39;];
				}
				if(isset($opt[&#39;auto_send_etag_header&#39;])){
					$this->auto_send_etag_header=$opt[&#39;auto_send_etag_header&#39;];
				}
				if($opt[&#39;create_fn&#39;] && is_string($opt[&#39;create_fn&#39;])){
					$this->create_fn=$opt[&#39;create_fn&#39;];
				}
				if($opt[&#39;create_par&#39;]){
					if(is_array($opt[&#39;create_par&#39;])){
						$this->create_par=$opt[&#39;create_par&#39;];
					}else{
						$this->create_par=[$opt[&#39;create_par&#39;]];
					}
				}else{
					$this->create_par=[];
				}
				$this->scacher->scacher($opt);//更新的数据写入（好吧，其实并没有什么卵用）（好吧，可以提前判断缓存路径有没有效）
			}
		}
		
		private function mode_etag(){
			$this->scacher->scacher([&#39;name&#39;=>$this->name.&#39;.etag&#39;]);
		}
		private function mode_data(){
			$this->scacher->scacher([&#39;name&#39;=>$this->name.&#39;.&#39;]);
		}
		public function etag_chk(){
			$this->mode_etag();//设置etag模式
			$etag=$this->scacher->get();
			echo_debug(&#39;test etag&#39;);
			echo_debug($etag);
			if($etag[&#39;success&#39;]){
				$etag=$etag[&#39;data&#39;];
			}else{
				return $etag;
			}
			$s_etag=$_SERVER[&#39;HTTP_IF_NONE_MATCH&#39;];
			echo_debug(&#39;etag from browse&#39;);
			echo_debug($s_etag);
			if($etag){
				if($s_etag==$etag){
					if($this->auto_send_etag_header){
						if($this->force_cache){
							header(&#39;Cache-Control: max-age=0&#39;);
							header(&#39;Expires: &#39;.gmdate(&#39;D, d M Y H:i:s&#39;, time() + SERVER_TIME_SHIFT + 10 ) . &#39; GMT&#39; );
						}
						header(&#39;Etag:&#39;.$etag,true,304);
						die();//必须die，否则还会继续执行下去。
					}else{
						return [	&#39;etag&#39;=>$etag,	&#39;statue&#39;=>DEF_ECACHE_PERFECT	];
					}
				}else{
					if($this->auto_send_etag_header){
						if($this->force_cache){
							header(&#39;Cache-Control: max-age=0&#39;);
							header(&#39;Expires: &#39;.gmdate(&#39;D, d M Y H:i:s&#39;, time() + SERVER_TIME_SHIFT + 10 ) . &#39; GMT&#39; );
						}
						header(&#39;Etag:&#39;.$etag);
					}
					return [	&#39;etag&#39;=>$etag,	&#39;statue&#39;=>DEF_ECACHE_BROWSER_NULL	];
				}
			}else{
				return [
					&#39;etag&#39;=>&#39;&#39;,
					&#39;statue&#39;=>DEF_ECACHE_ETAG_NULL
				];
			}
		}
		
		public function etag_create($auto=false){
			$etag=md5($this->category.&#39;:&#39;.$this->name.&#39;:&#39;.time().&#39;:&#39;.ranstr());
			$this->mode_etag();
			$this->scacher->set($etag);
			if($auto){
				if($this->force_cache){
					header(&#39;Cache-Control: max-age=0&#39;);
					header(&#39;Expires: &#39;.gmdate(&#39;D, d M Y H:i:s&#39;, time() + SERVER_TIME_SHIFT + 10 ) . &#39; GMT&#39; );
				}
				header(&#39;Etag:&#39;.$etag);
			}
			echo_debug(&#39;etag create finish:&#39;.$etag);
			return [
				&#39;success&#39;=>true,
				&#39;etag&#39;=>$etag,
				&#39;status&#39;=>DEF_ECACHE_ETAG_CREATED
			];
		}
		
		public function data_get(){
			//PR(&#39;begin get data&#39;);BR();
			$this->mode_data();
			$data=$this->scacher->get();
			if($data[&#39;success&#39;]){
				echo_debug(&#39;orgin data is:&#39;);
				echo_debug($data[&#39;data&#39;]);
				$data[&#39;data&#39;]=unserialize($data[&#39;data&#39;]);
			}else{
				echo_debug(&#39;not success:&#39;);
				echo_debug($data);
				$data[&#39;data&#39;]=&#39;&#39;;
			}
			echo_debug();
			echo_debug(&#39;the data is:&#39;);
			echo_debug($data);
			return $data;
		}
		public function data_create($auto_etag=false){
			if(!$this->create_fn){
				throw new Exception(&#39;<ECACHER>未传递数据生成函数<br/>当前参数：&#39;.$this->category.&#39;.&#39;.$this->name);		//这样的错误时不允许的，因此直接抛出错误
				die();
			}
			$data=call_user_func_array($this->create_fn,$this->create_par);
			//生成数据的处理
			if($data===false){
				throw new Exception(&#39;<ECACHER>生成数据失败<br/>当前参数：&#39;.$this->category.&#39;.&#39;.$this->name);		//无法，只有不返回false了
				die();
			}
			//PR($data);
			$s_data=serialize($data);
			$this->mode_data();
			$res=$this->scacher->set($s_data);
			if(!$res[&#39;success&#39;]){	return $res;	}
			if($auto_etag){
				$res=$this->etag_create();
				if(!$res[&#39;success&#39;]){	return $res;	}
			}
			return [&#39;success&#39;=>true,&#39;data&#39;=>$data];
		}
		
		public function clear($p=[&#39;etag&#39;,&#39;data&#39;]){
			if(in_array(&#39;both&#39;,$p)){
				$p=[&#39;etag&#39;,&#39;data&#39;];
			}
			if(in_array(&#39;etag&#39;,$p)){
				$this->mode_data();
				$res=$this->scacher->del();
				if(!$res[&#39;success&#39;]){	return $res;	}
			}
			if(in_array(&#39;etag&#39;,$p)){
				$this->mode_etag();
				$res=$this->scacher->del();
				if(!$res[&#39;success&#39;]){	return $res;	}
			}
			return [&#39;success&#39;=>true];
		}
		
		public function one_key(){
			$r=$this->etag_chk();
			if(!$r[&#39;etag&#39;]){
				echo_debug(&#39;the etag is null,should be rebuild&#39;);
				echo_debug($r);
				$this->etag_create(&#39;auto&#39;);
			}
			$res=$this->data_get();
			if($res[&#39;success&#39;]){
				//PR($res);
				if($res[&#39;data&#39;]){
					diehere($res);
				}
			}
			echo_debug(&#39;recreate data&#39;);
			
			$data=$this->data_create();
			diehere($data);
		}
	}
?>
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4. [代码]get_departments.php 

<?php
//实在受不了每次的数据的读取咯，所以按照以下的方式进行处理：
//对于部门，因为内容不算很多，120多个的样子，有效部门90个的样子，因此将其一次性进行处理，使用这个东西来创造，使用缓存机制
//如果数据没有变化的，就读取缓存，如果有变化的，就发送数据
//redlz2500@20151022
	define(&#39;IN_SERVER&#39;,1);
	require(&#39;../../../DEF.inc.php&#39;);
	require(ROOT.CLS_ECACHER);
	
	//define(&#39;ECHO_DEBUG&#39;,0);
	//define(&#39;ECHO_DEBUG&#39;,1);
	
	$e=new ecacher([
		&#39;create_fn&#39;=>&#39;get_departments&#39;,
		&#39;path&#39;=>&#39;json&#39;,&#39;category&#39;=>&#39;common&#39;,&#39;name&#39;=>&#39;department&#39;
	]);
	
	$e->one_key();
	
	die();
function get_departments(){
	$sql=&#39;select `depid` as `id`,`name`,`father`,`departcode` as `code` from `department` where `father` !=0&#39;;
	
	$rs=run_sql($sql);
	$data=[];
	require_once(ROOT.INC_MAIL);
	while($row=mysql_geta($rs)){
		$address=get_dep_mail_address($row[&#39;id&#39;]);
		$fullname=explode(&#39;.&#39;,$address);
		$fullname=array_reverse($fullname);
		$fullname=implode(&#39;.&#39;,$fullname);
		$row[&#39;fullname&#39;]=$fullname;
		$data[]=$row;
	}
	return $data;
}
?>
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5. [代码]get_users.php 

<?php
//本来想一次性全部读取，想到数量还是有点儿大，还是按照部门来读取好了
//redlz2500@20151022
	define(&#39;IN_SERVER&#39;,1);
	require(&#39;../../../DEF.inc.php&#39;);
	require(ROOT.CLS_ECACHER);
	
	$par=$_POST;
	$par=$_GET;
	$res[&#39;success&#39;]=false;
	if(!$par[&#39;depid&#39;]){
		$res[&#39;error&#39;]=err_a(&#39;errU038&#39;,&#39;参数缺失&#39;);
		diehere($res);
	}
	if(!isDecimalNumber($par[&#39;depid&#39;])){
		$res[&#39;error&#39;]=err_a(&#39;errU039&#39;,&#39;参数错误&#39;);
		diehere($res);
	}
	$e=new ecacher([
		&#39;create_fn&#39;=>&#39;get_users&#39;,
		&#39;create_par&#39;=>$par[&#39;depid&#39;],
		&#39;path&#39;=>&#39;json&#39;,&#39;category&#39;=>&#39;common&#39;,&#39;name&#39;=>&#39;users_in_&#39;.$par[&#39;depid&#39;]]);
	
	$e->one_key();
	
function get_users($depid){
	$sql=&#39;select `uid`,`name`,`login`,`depid` from `user` where `register` = 1 and `depid` = &#39;.$depid;
	$rs=run_sql($sql);
	$rs=rs_2_array($rs);
	return $rs;
}

?>
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6. [代码]get_users_complex.php 

<?php
//本来想一次性全部读取，想到数量还是有点儿大，还是按照部门来读取好了
//redlz2500@20151022
	define(&#39;IN_SERVER&#39;,1);
	require(&#39;../../../DEF.inc.php&#39;);
	require(ROOT.CLS_ECACHER);
	
	$res[&#39;success&#39;]=false;

	$e=new ecacher([
		&#39;create_fn&#39;=>&#39;get_users&#39;,
		&#39;create_par&#39;=>$par[&#39;depid&#39;],
		&#39;path&#39;=>&#39;json&#39;,&#39;category&#39;=>&#39;common&#39;,&#39;name&#39;=>&#39;users_all&#39;]);
	
	$e->one_key();
	
function get_users(){
	$sql=&#39;select `uid`,`name`,`login`,`depid` from `user` where `register` = 1 &#39;;
	$rs=run_sql($sql);
	require_once(ROOT.INC_MAIL);
	$data=[];
	while($row=mysql_geta($rs)){
		$addr=_get_user_mail_address($row[&#39;login&#39;]);
		$row[&#39;addr&#39;]=$addr;
		$data[]=$row;
	}
	return $data;
}

?>
Copy after login

                   

                   

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